Cheapest return flights from Ontario to San Jose in January from $357

AirHint found the following cheapest return flights from Ontario (ONT) to San Jose (SJO) in January 2026 (see full year).

Return flights

23 Jan - 30 Jan Frontier Airlines
22 Jan - 25 Jan Avianca
24 Jan - 31 Jan Avianca
15 Jan - 20 Jan Avianca
20 Jan - 26 Jan Avianca
15 Jan - 19 Jan Avianca
01 Jan - 28 Jan Southwest Airlines
14 Jan - 18 Jan Southwest Airlines
16 Jan - 20 Jan Southwest Airlines
16 Jan - 23 Jan Southwest Airlines

Also check the deals for one-way flights from Ontario to San Jose in January.

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